Method of making die-cast sliders



Feb. 1952 N. J. POUX' METHOD OF MAKING DIE-CAST SLIDERS Filed Nov. 15, 1945 INVENTOR. NOEL LJ. ,POUX. BY v TTORNEY Patented Feb. 5, 1952 UNITED ATENT "OFFICE v v, 8 9m M p I V No11JfPoux,' Mzavi11e, Pa.;a:ss'ignor toTalon, v lnc a, corporation of Pennsylvania.

Anp licationNoveinber 15, v1 9 45, iSerialiNo. 628,753

' This invention relates 'toan improvea'methud forimaking die-eastsliclrblanks.'

Such a sheer consists"rirallyoi'a"pair fof 5Gleiinis. (01.18 550 the renewing specification, and will be 'paiueu V 'larl'y pointed out'in' the appended lai'ms'.

a Y-shaped channel within the slider body through whichthe "fastener elementsare "adapted IInftlie' accompanying drawingsfthre is' shown 'f6r 'the purpose "of illustration, an embodiment whih my'i'n'vention may'assume'in practice.

In these erawing's:

TFigIfis a pan View of oxi'e' 'artoi the die" T01 pr'aticing "the method "(if th'epr'eseht "invention. 7 '2 is'alil an'fivvof "'th'e'other )al'tiif the to pass. There is usually'arranged'on the outer m die side of one of the Wings, meanssuchfa'salug Fig. 3'is'a rosssectionalview throughthe'die for attaching 'a pull or other member thereto for' parts "showing "the dies separated for removing manipulating the slider to "open and close the the's liderblank'fromthe'die.

fastener in a mannerwell-knowmto those skilled "Fig.4 is a secti'on'al 'view taken'on line dl'of in the art. I 3.

Various methods of die-casting sliders have been heretofore suggested -and *practiced, but such die oasting methods were not entirely satisfactory. Usually, such methods employed complicated cores and multiple-part dies which were Fig. "5 "is a sidejjelevaltional View of the"slid'er bodyshowin'g how'the Wings o'fthe 'die ca'st'blank are bent to position to Torm'the finished slider.

Fig. '7 is 'a"'sectional viewta ken online 7 v .l not onlyexpensivein their manlgfactlre fig? to of Fig.6. I maintain, but an-excessive-num er 0' has ngs ig. 8 is a perspective View showing how "a 'were'formecl'on the resulting casting due to the plurality of interconnected slider blanks may be numerous die partings which we're 'dbjectionable castfinfafgang die; and I and necessitated expensive equip'mentand'addi- Fig. {'9 is afpersp'ective View of the 'die cas't tional operations to remove. Likewise, the-use sliderblank of my invention as formed inthe of such dies and cores resulted in uneven and die. irregular internal slider surfaces, because-of the i "Referring =morefparticu1ar'ly to the drawings, inaccuracies in the movable die parts and/or h'ere isshown imFigs. S-thr'ough 6,'a-'slider made imperfect fitting thereof. Also, the angles at lnjaccorfiarlce w th the "present nvention, conwhich the cores or parts could-be withdrawn or isisting fof an integral or die-cast body having separated, limit-ed the internal contours obtaina flip P a Q 'W h portion *2 and a "lower able in sliders'manufactured :by use of such die's fgl "Q gi n 'pQ g gl *3 n fg allly connected toand tge era' one-en y a re ative y narrow, sub- In the present invention, there is provided a l fPgFg glY g neckporti'onk method wherein thes'lider blank consisting pf a W39 lvld'es 8 e n t ro pair of wings integrally connected tog'ethe'r by a ginteriaott or neck portion is die-cast in a single piece in 'a f H p v -1 1 e-su s antwo-part die and the wings are bent together to 2 31 %,Yr '9 9 W f ov'erlying position by a simple bending operation j i' f ge of the Ym Z to form a finished slider body thereby 'eliminatthe b 2 g i mg gesmi gs i f e inunioates with'theY sliaped chanhelwithin'the ccorqlngha the slider. On the outerside'of the upper win'g i t m p.rovlde. i i mi q thereiis iprovided'anoutwardlyprojecting long n of malnng die-cast sliders in one p jwl m tudinallytextending bar soas'to provideah'ollow simple and inexpensive, thereby reducing matemg po-rtidnfi to whihiza punjmember is adapted Y im f 9 to beattachedTorImanipuIatiHg thefsli'derto'open It 15 a h obJect of thls mventwn 9 3 and :olose the fastener with which the slider is v de 'an improved method "of 'dIe-castin'gf'sh'd'ers used, inBEL manner welbknown those skilled wherein the sliderblanks may, if desired, fbe'e'ast in a gang die so that "a plurality of blanks'ma'y be cast at onetime interconnected by "gate's" which aid in removing the slider "blanks "from the die and handl-ing'insubsequent operations.

Various other objects and advantage's'of this invention willbe more apparent'i'nithe course of in the art.

In practicing :my improved-method of manufacturing such sliders, unitary die-cast slider blanks, as shown in 9 of the drawings, are pro ucediby a-die-casting operation. As-s hown in l tl rough- 4 oi the drawings, (such slider blank Gare .forifiingfin a die consisting of two parts 8 and 9. The die part 8 has an impression In formed in the inner face thereof corresponding to the outer contour of the slider blank, including an impression l2 in which the bar or lug 6 i formed. In the other part 9 of the die, there is formed on the inner face thereof an impression 13 having a contour conforming to the inner surfaces of the slider blank including four impressions M for forming the flanges 5 of the slider, a V-shaped impression l5 centrally of the die for forming the wedge-shaped web or neck, and an outwardly projecting portion l6 which cooperates with the impression l2 in the die part i to form the hollow lug 6 of the slider blank. These die parts are movable toward and away from each other with each forming one half of the resulting casting H. The opposed impressions in the die parts for forming the wing portions of the slider are disposed substantially parallel to each other and with the impressions for forming-one of the respective wings arranged at an angle substantially of 45 degrees to the vertical, whereby in the resulting casting the wing portions are arranged substantially 90 degrees to each other. On the inner surface of the die part 8 at the parting line of the dies at either side of the wingforming impressions, there are provided passageways l8 forming the gate for admitting the casting material into the die impressions. There is arranged directly opposite each of these passageways l8 in the lower part of the die, a plurality of pins 19 which extend through holes in this die part and are provided for the purpose of ejecting the casting from the die in a manner hereinafter to be described:

In forming the casting, it will be understood that the two parts of the die are closed with one arranged on top of the other so as to provide an impression between the adjacent surfaces thereof conforming to the slider blank. The die-casting material is forced into the impression between the die parts through the passageways I8 at the parting line of the dies. After the casting has been formed, the dies 8 and 9 are separated, as shown in Figs. 2 and 3, and the pins l9 eject the casting from the impressions of the lower die. It will be noted that when the casting is to be removed that the dies are movable relative to each other substantially in the same plane and in a straight line the impressions in the dies are substantially parallel to the wing and neck portions formed by the resulting casting. The resulting casting is a slider blank having the wing portions 2 and 3 thereof arranged angularly (substantially 90 degrees) relative to each other with the wing portions being integrally connected together centrally of the blank by the relatively narrow thickened web or neck portion 4.

It will be understood that many different types of casting or molding material may be employed in practicing my method which is primarily pressure casting; for example, various kinds of metals or metal alloys, as well as thermoplastic materials capable of being molded or cast. In the metal group such base metals as zinc and tin, or alloys containing such metals may be used, or magnesium, aluminum, aluminum alloys, and suitable powdered metals also may be used. In the synthetic plastic or thermoplastic class such materials as cellulose acetates may be employed.

After the casting operation and the casting has been removed from the die, it is trimmed to remove any fins or flashings of metal, as well as the gates 20, so as to provide a slider blank as movement, so that tion,

neck or web portion 4 to overlying position so that one of the wings and the flanges carried thereby are spaced apart from the other wing and the opposed flanges thereof so as to provide a completely formed slider body. In the bending operation, the -slider-blank is preferably heated to a temperature of approximately 250 degrees F. and the wings bent as above described while the blank is in such heated condition so as to eliminate any danger of cracking the casting at the neck portion of fissures occurring therein, which might happen if the casting were not heated at the time of bending. While there is shown in Fig. 5 a pair of opposed reciprocating ram-like members 2| for performing the bending operation, it will be understood that any suitable bending mechanism or device may be employed. In performing such bending. there is provided preferably a mouth gage 22 which is positioned between the wings 2 and 3 for insuring that there is provided the proper clearance between the wings after they have been bent to position. In other words, there is provided preferably an anvil or gage 22 positioned between the wings around which the wings are bent, which limits the bending action of the wings toward each other after they contact the anvil so that the wines will not be bent too close together; as it is well-known to those engaged in the manufacture of slide fasteners that it is necessary to have the proper clearance between the wing portions and the flanges in order that the slider can be moved freely along the fastener elements when in use.

It will be seen that my method lends itself to the casting of slider blanks in a gang mold so as to provide a series of interconnected slider blanks, as shown in Fig. 8 of the drawings. Slider blanks generally are rather small and difficult to handle separately and it might be advantageous to cast a series of these blanks in strip form, as shown in this figure, by means of a gang mold as such a strip of slider blanks can be more easily handled in subsequent operations to be formed on the blanks after the casting operation, such as removing the flanges, smoothing, plating and bending.

In the slider blank of the present invention, it will be seen that there is provided a hollow lug portion 6 so as to provide a chamber 23 in the upper wing 2 in under the lug B, which chamber communicates with the Y-shaped channel of the slider body. By providing such a lug construcit will be seen that any suitable locking means may be easily assembled within this chamher to provide, for example, an automatic lock slider.

.As a result of my invention, it will be seen that there is provided an improved method of making die-cast sliders which is simple and inexpensive and at the same time eflicient and effective in its use; thereby providing a method of manufacturing sliders at a minimum cost with a minimum amount of equipment. It will be seen that there are only two major steps involved in forming the slider by my improved method: first, the die-casting of the slider blank in the the slider wings to their spaced apart parallel position to form the finished slider.

;"While-I have shown and described an embodiment which my invention may assume in practice, it will be understood that this embodiment is merely'for the purpose of illustration and description, ,and that other forms may be devised within the scope of my invention as defined in the appended claims.

What I claim as my invention is:

1. The method of making die-cast sliders for slidefasteners of the type having a pair of overlying" spaced-apart wings joined at one end by a eck so as to provide an interior Y-shaped channel, which comprises die-casting a pair of slider-forming wings arranged angularly relative to one another, said wing portions being inte- /grally connected together by a thickened substantially diamond-shaped neck portion integral- 1y cast therewith and each of said wing portions having marginal flanges integrally cast therewith on their opposed faces and then bending said wings toward each other at said neck portion to overlying substantially parallel position to form the slider whereby said neck portion is workhardened as a result of said bending.

2. The method of making sliders for slide fasteners of the type having a pair of overlying wings joined at one end by a neck with each wing having opposed flanges at the sides so as to provide an interior Y-shaped channel, which comprises casting a pair of slider-forming wing portions arranged angularly relative to each other in an impression formed between adjacent surfaces of a pair of dies movable relative to each other substantially in the same plane and in a straight line movement and wherein said surfaces are substantially parallel to the wings and neck portions formed by the resulting casting, said wing portions being integrally connected together by a thickened substantially diamondshaped neck portion integrally cast therewith and each of said wing portions having marginal flanges integrally cast therewith on their opposed faces separating the dies and removing the casting from therebetween, and then bending the wing portions toward each other at said neck portion to overlying substantially parallel position to form the slider whereby said neck portion is work-hardened as a result of said bending.

3. The method of making sliders of the type having a pair of overlying wings joined at one end by a neck with each wing having opposed flanges at thesides and with one wing having a lug to/wlii ch a pull member is adapted to be /attached, which comprises casting a pair of sliderforming wing portions arranged angularly relative to one another with one of the wings having a lug portion projecting from the outer surface thereorin'an impression formed between adjacentsurfaces of a pair of dies movable relative to each other substantially in the same plane and in a straight line movement and wherein said surfaces are substantially parallel to the wings, neck and lug portions formed by the resulting casting, separating the dies and removing the casting, said wing portions being integrally connected together by a thickened substantially diamond-shaped neck portion integrally cast therewith and each of said wing portions having marginal flanges integrally cast therewith on their opposed faces from therebetween, and then bending the wing portions toward each other at said neck portion to overlying substantially par- 6 allel position to form the slider whereby said neck portion is work-hardened as a result of said bending.

4. The method of making die ca'st sliders for slide fasteners of the type having a pair of over lying spaced-apart wings joined at one end by a neck which comprises die-casting a plurality of blanks simultaneously in a multiple die, each of said blanks consisting of a pair of slider-form ing wings arranged angularly relative to one another with each of said wings being integrally connected to the wings of adjacent blanks by means of gates, said wing portions of each of said blanks being integrally connected together by a thickened substantially diamond-shaped neck portion integrally cast therewith and each of said wing portions having marginal flanges integrally cast therewith on their opposed faces, then bending the respective wings of each of said blanks toward each other at said neck portion to overlying substantially parallel position and removing the gates from between wings of said blanks so as to provide a plurality of individual slider blanks whereby said neck portion is work-hardened as a result of said bending.

5. The method of making die-cast sliders for slide fasteners of the type having a pair of over lying spaced-apart wings joined at one end by a neck, which comprises die-casting a plurality of blanks simultaneously in a multiple die, each of said blanks consisting of a pair of slider-forming wings arranged angularly relative to one another with each of said wings being integrally connected to the wings of adjacent blanks by means of gates, said wing portions of each of said blanks being integrally connected together by a thickened substantially diamond-shaped neck portion integrally cast therewith and each of said wing portions having marginal flanges integrally cast therewith on their opposed faces, then bending the respective wings of each of said blanks toward each other at said neck portion to overlying substantially parallel position, removing the gates from between wings of said blanks so as to provide a plurality of individual slider blanks whereby said neck portion is work-hardened as a result of said bending.

NOEL J. POUX.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,041,156 Sundback May 19, 1936 2,042,541 Marinsky June 2, 1936 2,048,650 Gilmore July 21, 1936 2,071,603 Winterhalter Feb. 23, 1937 2,078,745 Ulrich Apr. 27, 1937 2,160,160 Marinsky et a1 May 30, 1939 2,181,142 Marinsky Nov. 28, 1939 2,242,794 Puschner et al May 20, 1941 2,252,090 Morin et al Aug. 12, 1941 2,252,305 Puschner Aug. 12, 1941 2,297,245 Puschner et al Sept. 29, 1942 2,320,566 Carlile June 1, 1943 ,362,221 Sundback Nov. 7, 1944 2,364,100 Savitsky Dec. 5, 1944 2,410,135 Sundback Get. 29, 1946 FOREIGN PATENTS Number Country Date 340,548 Italy "me -"wig... May 20, 1936 

